On that date, scheduled changes include higher personal income tax rates, reduced itemized deductions for high-income taxpayers and increased taxes on capital gains and dividend earnings, to name a few.

More On Taxes:

Tax move No. 1: Increase your income

If the President George W. Bush-era tax cuts do expire as scheduled Jan. 1, 2013, income tax rates will go up across the board. The lowest tax rate will be 15 percent instead of 10 percent, and the top tax rate will go from 35 percent to 39.6 percent. The rates between those two extremes also will creep up a bit.

Rosica suggests taxpayers can have two year-end tax strategies: one for the current tax situation and the other in case the changes do take effect next year. "Develop a plan, and then pause and wait to see what transpires," he says.

If it looks like tax rates will be higher in 2013, accelerate income into 2012 to take advantage of the current lower rates.

Moving income into 2012 also could help eliminate or ease the new 0.9 percent Medicare tax that takes effect next year. This added payroll tax is part of the Affordable Care Act, or Obamacare, and applies to total wages (and self-employment income) that exceed $200,000 for individuals and $250,000 for couples filing a joint return.

Tax move No. 2: Take capital gains

The capital gains rate is 15 percent for most taxpayers and zero percent for taxpayers in the current 10 percent and 15 percent tax brackets. On Jan. 1, 2013, those rates are scheduled to increase to 20 percent and 10 percent, respectively.

By taking gains in 2012, taxpayers will avoid the potentially higher tax rates.

Those with higher incomes also will avoid another health care-related Medicare tax that takes effect next year. An additional 3.8 percent Medicare tax on net investment income will apply to single filers making more than $200,000 and married joint filers with combined incomes of more than $250,000.

Savvy taxpayers know they need to make some tax moves before each new year to lower their tax bills when they file their returns next year.

This year, any tax moves are complicated by the possibility that tax laws will change dramatically if Congress and President Barack Obama don't reach some agreement by year end. You've heard about the fiscal cliff.

So what should you do? If it looks like income tax rates will be higher in 2013, accelerate income into 2012 to take advantage of the current lower rates.

And capital gains rates are scheduled to increase on January 1st, so you can sell appreciated assets and take the gain now at lower tax rates. Right now they're at 15 percent for most taxpayers, and zero percent for those in the 10 and 15 percent tax brackets.

Some experts say you should make a plan, and then wait to see what happens before pulling any triggers.

These higher-income taxpayers could see the capital gains tax go from the existing 15 percent to 23.8 percent in 2013.

Investors also might want to look into reallocating their portfolios so that they don't own as many dividend-paying stocks. Right now, the tax on qualified dividends is the same as capital gains, 15 percent. On Jan. 1, 2013, dividends could be taxed at ordinary income tax rates.

So, a top investment earner next year could face a 43.4 percent tax on dividends: 39.6 percent maximum income tax rate plus the 3.8 percent health care surtax.

Tax move No. 3: Harvest investment losses

One easy way to reduce capital gains taxes regardless of rate is to sell assets that have lost value and then use those losses to offset gains.

But if the capital gains tax rate goes up in 2013, you might want to hold off on selling those losers this year. You can use them to reduce next year's higher-taxed gains.

"If this year's losses are less than the gains they would be offsetting, it might be wiser to hold them for an increasing tax rate environment," says Rosica.

Losses in excess of your gains also are useful at tax time.

Up to $3,000 a year in excess of losses can be used to reduce ordinary income. If you have more than that, you can use the loss amounts in future tax years. That could be helpful next year if capital gains and income tax rates go up as scheduled.

Tax move No. 4: Get medical, dental work done

Another health care act tax provision will make it more difficult to claim itemized medical deductions.

For 2012 taxes, medical deductions must exceed 7.5 percent of adjusted gross income before they can be claimed. In 2013, the expenses must be more than 10 percent of AGI.

"If there is a chance of exceeding the 7.5 percent floor this year, the individual may want to accelerate into this year discretionary medical expenses, such as prescription glasses and sunglasses, and elective medical or dental procedures not covered by insurance," says Robin Christian, CPA and senior tax analyst for Thomson Reuters in Fort Worth, Texas.

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